Thank you for sharing the wonderful banknote portraits Sam. They are fantastic study material.
I believe drawing with pen and ink also teaches much of the same discipline of shading and contour that we use in engraving.
Two books that are great for banknote and bulino study are Rendering in Pen and Ink by Arthur L. Guptill, ISBN 0-8230-4529-3 and Sketching Your Favorite Subject in Pen & Ink by Claudia Nice, ISBN 0-89134-472-1.
Another great book on banknote is Gustave Dore Engravings published by Alpine Fine Arts Collection (UK) LTD. ISBN 0-88168-019-4.
I wonder how the background was done on Teddy?
What is a ruling machine? Internet search showed only some paper ruling machines for notebooks and such.
I'm pretty certain this is what they use, Vilts. http://vintagemachinery.org/mfgindex/imagedetail.aspx?id=6322
is ruling machine another name for guilloché or rose turning machine?
seems that machine have same handles and stuff..
What is a ruling machine? Internet search showed only some paper ruling machines for notebooks and such.